The problem might be related to a lack of available memory. Although the mouse is still working, it is obviously complicated to work without a pointer. However, moving the mouse by dragging or clicking the left or right buttons repeatedly reveals that buttons and functions are actually working, and the cursor is simply invisible. You might occasionally experience problems when their mouse pointers disappear and the mouse doesn't work. The Mouse Pointer Disappeared or Became Invisible on a Mac Computer, How to Fix It?